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fix decay enum

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This commit is contained in:
terik23 2019-04-08 23:35:51 +05:00
parent da76bd607f
commit 4e1af5dc4e
1 changed files with 13 additions and 25 deletions
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38
include/magic_enum.hpp
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@ -212,18 +212,14 @@ template <typename T>
inline constexpr bool is_scoped_enum_v = is_scoped_enum<T>::value;
// Obtains enum value from enum string name.
template <typename E, typename = detail::enable_if_enum_t<E>>
template <typename E, typename = detail::enable_if_enum_t<E>, typename D = std::decay_t<E>>
[[nodiscard]] constexpr std::optional<E> enum_cast(std::string_view value) noexcept {
using D = std::decay_t<E>;
return detail::enum_cast_impl<D>(value);
}
// Obtains enum value from integer value.
template <typename E, typename = detail::enable_if_enum_t<E>>
template <typename E, typename = detail::enable_if_enum_t<E>, typename D = std::decay_t<E>>
[[nodiscard]] constexpr std::optional<E> enum_cast(std::underlying_type_t<E> value) noexcept {
using D = std::decay_t<E>;
if (detail::name_impl<D>(static_cast<int>(value)).empty()) {
return std::nullopt; // Invalid value or out of range.
} else {
@ -232,36 +228,32 @@ template <typename E, typename = detail::enable_if_enum_t<E>>
}
// Returns enum value at specified index. No bounds checking is performed: the behavior is undefined if index >= number of enum values.
template<typename E, typename = detail::enable_if_enum_t<E>>
template<typename E, typename = detail::enable_if_enum_t<E>, typename D = std::decay_t<E>>
[[nodiscard]] constexpr E enum_value(std::size_t index) {
using D = std::decay_t<E>;
constexpr auto values = detail::values_impl<D>(detail::range_impl<E>());
constexpr auto values = detail::values_impl<D>(detail::range_impl<D>());
return assert(index < values.size()), values[index];
}
// Obtains value enum sequence.
template <typename E, typename = detail::enable_if_enum_t<E>>
template <typename E, typename = detail::enable_if_enum_t<E>, typename D = std::decay_t<E>>
[[nodiscard]] constexpr decltype(auto) enum_values() noexcept {
using D = std::decay_t<E>;
constexpr auto values = detail::values_impl<D>(detail::range_impl<E>());
constexpr auto values = detail::values_impl<D>(detail::range_impl<D>());
return values;
}
// Returns number of enum values.
template <typename E, typename = detail::enable_if_enum_t<E>>
template <typename E, typename = detail::enable_if_enum_t<E>, typename D = std::decay_t<E>>
[[nodiscard]] constexpr std::size_t enum_count() noexcept {
using D = std::decay_t<E>;
constexpr auto count = detail::values_impl<D>(detail::range_impl<E>()).size();
constexpr auto count = detail::values_impl<D>(detail::range_impl<D>()).size();
return count;
}
// Obtains string enum name from enum value.
template <typename E, typename = detail::enable_if_enum_t<E>>
template <typename E, typename = detail::enable_if_enum_t<E>, typename D = std::decay_t<E>>
[[nodiscard]] constexpr std::optional<std::string_view> enum_name(E value) noexcept {
using D = std::decay_t<E>;
const auto name = detail::name_impl<D>(static_cast<int>(value));
if (name.empty()) {
@ -272,10 +264,9 @@ template <typename E, typename = detail::enable_if_enum_t<E>>
}
// Obtains string enum name sequence.
template <typename E, typename = detail::enable_if_enum_t<E>>
template <typename E, typename = detail::enable_if_enum_t<E>, typename D = std::decay_t<E>>
[[nodiscard]] constexpr decltype(auto) enum_names() noexcept {
using D = std::decay_t<E>;
constexpr auto count = detail::values_impl<D>(detail::range_impl<E>()).size();
constexpr auto count = detail::values_impl<D>(detail::range_impl<D>()).size();
constexpr auto names = detail::names_impl<D>(std::make_index_sequence<count>{});
return names;
@ -283,9 +274,8 @@ template <typename E, typename = detail::enable_if_enum_t<E>>
namespace ops {
template <typename E, typename = detail::enable_if_enum_t<E>>
template <typename E, typename = detail::enable_if_enum_t<E>, typename D = std::decay_t<E>>
std::ostream& operator<<(std::ostream& os, E value) {
using D = std::decay_t<E>;
const auto name = detail::name_impl<D>(static_cast<int>(value));
if (!name.empty()) {
@ -295,10 +285,8 @@ std::ostream& operator<<(std::ostream& os, E value) {
return os;
}
template <typename E, typename = detail::enable_if_enum_t<E>>
template <typename E, typename = detail::enable_if_enum_t<E>, typename D = std::decay_t<E>>
std::ostream& operator<<(std::ostream& os, std::optional<E> value) {
using D = std::decay_t<E>;
if (value.has_value()) {
const auto name = detail::name_impl<D>(static_cast<int>(value.value()));
if (!name.empty()) {